Cotton-dyestuffs.



No Drawing.

barre earns Tram are AUGUST BLANK, CARL HEIDENREIGH, AND JOHANNES JANSEN, OF LEVERKUSEN,

NEAR COLOGNE, GERMANY, ASSIGNORS TO FARBENFABBIKEN VORM. FRIEDE. BAYER 8c (10., OF ELBERFELD, GERMANY, A CORFORATION 0F GERMANY.

diaminodibenzoyldiaminostilben disulfonic acid of the formula: v

on-c5u,.so,n.N-n-co.c,rn.urn

n-cimsoinau-cocaa um. The new products are after being dried and pulverlzed in the shape of thelralkallne salts yellow to brewn powders soluble in water generally with a yellowish coloration and yielding upon reduction with stannous chlorid and hydrochloric acid diaminodibenzoyldiaminostillfen-disulfonic acid and an amin. They dye cotton yellow to orangered shades. These colors are rendered very fast to washing by after-treatment with formaldehyde of fibers dyed with them.

In order to illustrate the new process more fully the following example is given, the

parts being by weight 47 .3 parts of meta-- meta-diaminodibenzoyldiaminostilbendisul fonic acid (sodium salt.) are dissolved in 300 parts of hot "water, the solution is cooled with ice to 10 C. and diazotized with 50 parts of hydrochloric acid and 10 parts of sodium nitrite. The diazotation-is finished after stirring for 2-3 hours and the diazocompound is added to a cooled solution of 16 parts of resorcin in 700 parts of water containing 40 parts of Na CO After some time the mixture is heated to 7 0 C. and theazo dye is salted out. It is after being dried and pulverized in the shape of its sodium salt a yellow powder soluble in water with a yellow coloration; in caustic soda lye with an orange-yellow coloration; and being solu- Specification bi Letters Patent.

Patented Dec.30,1913.

Application filed March .22 1913. Serial No. 757,369.

ble in concentrated sulfuric acid of 66 B. with a yellowish coloration. It basin a free state most probably the formula:

' Upon reduction with stannous chlorid and hydrochloric acid meta-meta-diaminodibenzoyldiaminostilben-disulfonic acid and aminoresorcinare obtained. brlght yellow shades, which are rendered It dyes cotton in' fast to washing by treatment with formalrendered fast to Washing by an aftertreat ment with formaldehyde. j

2. The herein described new act) dyestufi' which has in a\free state most probably the formula:

cacn son NH coon N N CH/OH 5 5- z B 1 6 \OH which is after being dried and pulverized in the shape of its sodium salt a yellow powder soluble in water with a yellow coloration; in caustic soda lye with an orange-yellow coloration; being soluble in concentrated sulfuric acid of 66 B. with a yellowish coloration; and yielding upon reduction set our hands in the presence 0f two sub- Wlfh stgnnuus chlorld and hydrochlonc and scrlblng wltnasses.

meta mta diaminodibenzcyldiaminostilben- AUGUST BLANK. [11.5.] disulfqnicii cid and amino-resorcin; dyeing CARL I-IEIDENREICH. [1A. 5.]

a cottdfi-ifibzight allow shades, fast to wash- JOHANNES JAN SEN. [1 s.]

ing byv s'x-mafteptreatment with formalde- Whtnesses: hyde, substantiallyas described. IIEIJQN NUFER,

In testimony whereof we have hereunio ALBERT NUFER. 

